I was now successfully to vdr 1.7.10 with xineliboutput and vdpau
support running.

Output is via HDMI from my atom board.

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But I'm not able to get DD5.1 output over HDMI running.
Maybe someone can give a hint what is wrong or missing.
Here is an extract what I did to get xinelibout running:
Make sure you have a current gcc on the system, I used gcc-4.3.4.
gcc-config -l
gcc-config 2
source /etc/profile
I use the following versions: